In 2012, he moved to the tricolours, and was used off the bench as a back-up hooker to Jake Friend in the 2013 grand final, in which the Roosters prevailed over Manly.

He also played in the Roosters' 2014 World Club Challenge winning team which defeated Wigan.

After leaving the Bondi-based club mid-season in 2014, Mortimer joined the Gold Coast Titans, where he remained until the end of 2016.

His final stop in the NRL was at the Cronulla Sharks, where he played just two games in 2017 before commencing his brief UK stint.

10 years, 148 games, 1000's of great memories. The time has come to call it a day on my professional Rugby League Career. Thankyou Mum, Dad, my Brothers and Wife for all your support. To everyone else who played a role in my career, Thankyou with all my heart. Love Morts ❤️🙌🏼 pic.twitter.com/aRMZ2W7xLN